BR-1-08
Bryce, S.A., G.A. Lomnicky, P.R. Kaufmann, L.S. McAllister and T.L. Ernst. 2008. Development of biologically based sediment criteria in mountain streams of the western United States. North American Journal of Fisheries Management 28:1714-1724.

GR-2-94
Griffith, G.E., J.M. Omernik, T.F. Wilton, and S.M. Pierson. 1994. Ecoregions and subregions of Iowa: a framework for water quality assessment and management. The Journal of the Iowa Academy of Science 101(1):5-13.

BR-1-88
Brooks, R.P. and R.M. Hughes. 1988. Guidelines for assessing the biotic communities of freshwater wetlands. In: Proceedings of the National Wetland Symposium: Mitigation of Impacts and Losses. Association of State Wetland Managers, October 1986, New Orleans, LA. pp 276-282.

WH-1-88
Whittier, T.R. 1988. Report of the national workshop on instream biological monitoring and criteria. U.S. Environmental Protection Agency. Office of Water Regulations and Standards. Washington, DC. 33p.

OM-2-81
Omernik, J.M., A R. Abernathy, and L.M. Male. 1981. Stream nutrient levels and proximity of agricultural and forest land to streams: some relationships. Journal of Soil and Water Conservation 36(4):227-231.